Processor Time:
Processor time used is probably the best measure of "responsiveness". Background processes that dramatically reduce CPU cycles (like on-access antivirus) are highly undesirable.
Memory Consumption:
The amount of memory antivirus scanners use, greatly influences the overall "responsiveness" of the operating system.
Virtual memory:
Games tend to be huge consumers of memory, so any memory swapping is bound to produce slow-downs.
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